​From Wikipedia, the free encyclopedia.   Robert "Bob" Guillaume (November 30, 1927 – October 24, 2017) was an American stage and television actor, best known for his role as Benson Du Bois on the TV-series Soap and the spin-off Benson, voicing the mandrill Rafiki in The Lion King and as Isaac Jaffe on Sports Night. In a career that spanned more than 50 years he worked extensively on stage (including a Tony Award nomination), television (including winning two Emmy Awards), and film. Description above from the Wikipedia article Robert Guillaume, licensed under CC-BY-SA, full list of contributors on Wikipedia.